Die head



Nov. 17, 1931.

C. P. HARRISON DIE HEAD Filed Aug. 5, 1929 3 Sheetsj-Sheet l Nov. 17, 1931. c, P', HARRlsoN 1,831,957l

- DIE HEAD v Filed Aug. 5. 1929 3 sheets-Sheet 2 g A y a Q @M @Ya/1m. Y

Nro/fm1 y C. P. HARRISON DIE HEAD Nov. 17, 1931.

Filed Aug. 5. 1929 Sheets-Sheet 3 M mm Patented Nov. 17, 1931 UNITED sf'rATEsA PATENT or-FICE CHARLES I. HARRISON, F WESLEYVILLE, PENNSYLVANIA, ASSIGNOR TO JARECKI MANUFACTURING C0., OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYIr VAN IA DIE HEAD Application mea August V, 17929. seriai No. 383,571.

This invention relates to a die head for threading pipe upon the type of machine in which several sizes of pipe are threaded in the same die head without changing chasers for the different sizes of pipe.

It is an object of this invention to provide means whereby the diehead will 'open automatically when the pipe has been threaded to any standard length.' Devices with this general object have heretofore been proposed but they were limited to a singlefstandard and allowed at the most but very slightvariations, either long or short, from such standard. v

Another object of the invention is to provide means whereby an opening device-can be made to operate at the correct thread length of different standards of threads or at a length measurable on a dial in inch graauations. Standards for threads on pipe have undergone a change. There was a time when the Briggs standard covered nearly all requirements, but now we have the American Petroleum t Institute (A. P. I.) standards `which are being adopted inthe oil fields,

therefore, it is an object of this invention to also cover these new standards as' well as the old.

Another object of the invention is to provide means whereby 4thetripping device is automatically withdrawn from the work by power as the die opens and returns when die is closed again.` It has heretofore beenproposed to provide tripping devicesor triggers for causing the die heads on such machines as screw threading machines to open automatically when the thread isfinished,`but Yin such machines the trigger had to be moved out of operative position by the threaded pipe and experience shows that the finished thread was often marred by the trigger, which drags over the thread in being so withdrawn from operative position. i

Another object of the invention is to provide means whereby the operating means is connected to the carriage instead of the die head, which makes a better and simpler application for a taper attachment.

Another object of the invention is to provide means whereby the setting means has a revolving or worm action for setting t0 size, and a. sliding or rack action for opening and closing. k

Referring to the drawings which are' hereby made a part hereof, and on which similar reference characters indicate similar parts:

' Fig. 1 is a front elevation of the die head and operating device with the die in closed or threading position,

Fig. 2,:1. side elevation of said head viewed from the right, Y

Fig. 3, an enlarged front View of the operating device, with parts in section,

' Fig. 4, a side elevation of said device viewed from the right,

Fig. 5 is a front elevation of the die head showing the operating device when the die is in open position, and

Fig. 6, al side elevation of said die head and device viewed from the right.

In the drawings reference character 7 in dicates a die head mounted on a supporting bracket 8 which is secured to the sliding carriage 9, the same being slidably mounted on a bed 10. Y

A set of chasers 11 is shown in Fig. 1 as being mounted in a circular series about the work, the chasers being mounted in Chaser holders 12 (Fig. 3) ,which chaser holders are mounted for radial adjustment in slots in the die head 7. The Chaser holders are moved radially by means of a cam plate 13 mounted on the frontof the die head in any suitable manner andl arranged to be oscillated about the axis of the die head. The chaser holders,

4or blocks are connected by means of known character to cam slots 14- in the cam plate. he cam plate can be adjusted about its axis to vary the position of the chaser holders according to the size ofthe Work, an extreme position being indicated in the dotted lines inA Fig. 1,.this being for example an open position of thechaser holders and chasers for threading a pipe of small size. For adjusting the plate about its axis I have provided a worm 15 ony a shaftV 16 said shaft having a hand wheel 17 for turning the shaft and the worm being splined to the shaft so as to be slidable endwise of the shaft and of its own length but being compelledto rotate with justment and also locking itself automatically in adjusted position.

In addition to the adjusting movement of the cam plate by rotation of the worm I have also provided for opening and closing the head by moving the worin in the direction of its length so that itl acts as a rack upon the rackteeth ol lthe. cai'n plate. For this purpose a coil spring'20 surrounds the shaft, this .spring being shown in lcompressed position in Fig. 1 and in expanded position in Fig. o.'

Adjustingmeansfor varying Athep'ressure of the spring against the end oii the worin i* comprises `an externally threaded sleeve 27 engaging threads in the adjacent part of casing 9. Rotation of the head 2B of this sleeve adjusts the tension of the spring to the correct extent for opening the die head. The

V spring tends to move the worin to the right for opening the head. For moving the4 worm as a rack to the left a sleeve 29 e'iiciicles the shaft 16 said sleeve being held against rotation by a roller 30V secured by a screw 31 to the sleeve 29, said roller being free to move in a direction parallel vto shaft 16 along a slot whose ends are indicated at 32, V32v in Fig. l. The sleeve 29 has a cam face 33 and a nat end Iface at 34. A sleeve 35 coaxial with shaft 16 is provided at one end with a handle '36 and at the other with a cam face 37 adapted to cov operate with the cain face 33 for moving the sleeve 29 and the worm 15 to the left. At the end of such movement a i'lat end iiace 40 (Fig. 3) on sleeve B5 rides up on the 'end face of sleeve 29, as indicated in Fig. so that the part-s are securely heldL against the action of spring 20. sleeve 35 has a shoulder at 41 bearing against the thrust washer 42 located between such shoulder and the ladjacent portion of the sliding carriage 9. l Y

A spring pressed plunger 43 (Fig. 2) bears against a downwardly projecting lug 44 on the lever 36, this plunger serving to rotate the sleeve B5 far enough to carry the ilat end 'faces 34 and 40 out of engagement with one another after which the spring 2O can move the worin 15 and the sleeve 29 to the right for the purposeof opening ythe die head by retractingthe Chaser holders iii radial direction. A det-ent 45 (best shown in Fig. 4)

holds vthe lever 36 against the action of the spring pressed plunger, the `forward end oi the detent engaging a shoulder 46 on Jthe lever for this purpose. Screw 47 secures a hardened steel plate 4 5" to the detent 45 so that when the action of latching and unlatchi'ng The enlarged inner end of` collar 54 fixed to the shaft and at the other end against a bracket 'thereby holding the shaft normally in elevated position with the trigger in position to engage the work. At

`the loweieiid ci the shaft a set screw 56 provides adjustable means for engagement with the detent 45. A spring 57 normally holds the detent in position to engage the shoulder 46 and holdV the lever 36 in the position indicated in Fig. 2 until released by the pressure of the shaft 52.

Adjusting means for varying the length of the thread is provided in connection with the shaft 49 and'pinion 50. Such means coinprises' a' thrust washer 58 bearing against a shoulder von 'shaft 49 and a dial 59 having graduations in Various series according to different standards, here illustrated as comprising 'the Briggs standard and the A. I. I. (American Petroleum Institute) standard. An arm 60 'carries an index linger 61 extending over the face of the graduated dial The dial is splined to the shaft and the arm 60 is' loosely mounted on an extension ot the body of the pinion 50. A nut 62 on the threaded end of shaft 49 provides means whereby the dial, the arm, the pinion andthe -thrust washer may be clamped together 'against the shoulder on shaft 49 alter the indicator finger has been properly positioned on the face of the graduated dial, ,thus bringingthe trigger 48 to desired position relative to the end ofthe pipe to be threaded.

In setting the trip the nut 62 is backed oli to permit rotation of linger 60 and pinion 50, the shaft 49 is turned to bring the 'trip 48 to 'desired position, the linger is brought into 'vertical position 'and the nut G2 is again tightened to cl'ainp 'finger 60 and pinion 50 to the shaft. The linger will now indicate on the scale a different position, corresponding to the 'new position of the trip, land this will be shown according to both the A. P. I. standard andthe Briggs standard.

For moving the trigger out of the way of the woilr so that it will not 'drag over the threads o'n the same a vertical shaft 63 is mounted for recproeaton in the bracket 55, said shafthaving at its lower end a projectiig 'stud 64 for engagement with a lug 65 (digs. 'land 3) on lever 36. ri`he shaft 63 is held in `its uppermost position by a spring 66 bearing Aat one end on the bracket and at the otlierfend on an 'arm 67 iixed to the shaft andalso encircling Vshaft 52 above the collar 54.

' Amismas? In the operation of my device the die head is set according to the size of the work by rotating hand wheel 17 in one direction or the other to bring the chasers to pro per position. Thereupon the handle 36 is oscillated from the position of Fig. 6 to that of Fig. 2, the cam face 37 sliding over cam face 33 and forcing the sleeve 29 and worm 18 to the left to rotate the cam plate 13, thus bringing the chasers into closed or working position as shown in dotted lines in Fig.' l. As the head reaches closed position the face 40 rides upon the face 34 and the detent 45 engages shoulder 46. The work of the head -now proceeds un-` til the end of the thread is reached, whereupon the end of the work strikes trigger 48, swinging the same from the position of Fig. 2 toward the position of Fig. 6. The pinion now moves the shaft 52 downward until such movement releases detent 45 whereupon plunger 43 forces the projection 44 of lever 36 to the left in Fig. 2 until the face 40 is free of face 34 whereupon spring 20 moves the worm i3 and sleeve 29 to "the right, the action of the cam faces on the sleeves 29 and 35 throwing the lever 36 to its eXtreme position illustrated in Fig. 6. In its movement to,-V warifl this position the lug on the lever strikes stud 64 andpulls down shaft 63 with its arm 67 whereupon arm 67 strikes collar 54 and forces shaft 52 to its extreme downward position, thereby throwing` trigger 48 into the dotted line position of Fig. 6 out of the way of the work. After removal of the work and entry of a new piece of work the movement of lever 36 back toward the position of Fig. 2 releases shafts 63 and 52 thus permitting the springs 66 and 53 to elevate the shafts back to. their working position and bring trigger 48 into working position.

It will be obvious to those skilled in the art that many changes may be made in the construction above described and therefore I d0.. not limit myself to the details shown in the drawings and described in the specification but only as indicated in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent is l. A die head comprising a set of radially movable chasers, a cam plate connected to all the chasers, a worm engaging teeth on the cam plate for adjusting the setting of the chasers, means for rotating the worm, and means for giving the worm an en dwise movenient for opening and closing the head, said last-named means including a trip in the path of the work, substantially as set forth.

2. A die head comprising a set of radially movable chasers, a cam plate connected to` all th e chasers, a worin engaging teeth on thev cam plate for adjusting the setting of the chasers, means for rotating the worm, means for giving the worm an endwise movement for opening and closing the head, said last- .i named means. includingaatrip 1in the, path of the `work, :and automatic means .acting to moveithe trip out of the '-way ofithe-work in :connection with 'the foperation of opening the? head,l suhstantallyasset forth. v

In a device of the.eha1acter f described, a bed, a carriage slidable thereon,a die head omthe carriage, chasers onithe head, a earn plate connected to the chasers, `said cam plate. having gear teeth aworm on thereaf- ,rage engaging said-teeth, means `for rotating :the/wormI toset the chasers for different sizes f of` the .work, automaticV means on,` thecarriage ffor movingithe .Wormendwiseto cause it to .actes a rack `for openingfthe head, .atrip onithe head in thepath ofthe Work, means toprevent operation of saidfautomatic. means while the die head is .in operation, and conneetionsfrom said tripto release thelastnamed means, substantially asfset forth.

A, -machineofthe character described, comprising a die head, and'cl'iasers thereon, in eomhination with automatic meansjfor openingthe khead including .algauge inlthe path of the work, a shaftconneetedto ythe gauge to be oscillated by movement/thereof, a dia-l secured to .the-shaft to oscilla-tetherewith, a piniony encirclingthe shaft and 1 adjustable. about:the. same, an indicating' finger for the` dial releasably secured to-sad .pinionl means for-securing the finger andpinion in adjusted Vposition `on :the `sha-ft, a springpressed plunger.v having rack Ateeth engaging the pinioma handle forA closing thehead, and a detent for s-aidhandle,` said detentlheing in `position-to be tripped by saidplungelg substantially asset forth.

Inga machine of the character described, -a bed, a carriage thereon,.adie-head on the carriage, chaserson thehead, acamplaite connected tothe chasers,fa worm engaging withteethon the camplate, a shaft on the carriage independent of i the i head -to which shaft .the worm is .-splined,1 means for rotating the shaft toadjustthe chasers, resilient means for moving the worm toward one end .ofthe shaft, and aihandle oli-.the carriage .apart from'ithefhead',l said handle being connected to the Wormfforimovingitltoward the other end of the shaftfthe endwisemovemmt of the wormserving toppen and close the head, substantially as set forth.`

6. 'Inv a. machine of? the character described, a bed,.a carriage Vthereon, adiehead on the carriage .chasers on thefhead, va cam platt connected to the chasers, a worm engaging with teethion the cam plate, ak shafton the carriage apart 3fronithev head Lto .which y shaft the `worm is splined, means for rotating the shaft and the 4worm tov adjustthe chasersI "f -resilientxneans for moving the worm' endwise along the shaft ilronedireetion, a sleeve en circling ,thefshaft adjacent the worm and having :a cam face, means for holding said sleeve against rotation, and a sleeve having isc a handle and also havine' I'n'eans coacting with the sald cam face for moving the first-named sleeve and the worm along the shaft in the opposite direction whereby the endwise movements of the worm rotate the cam plate to open and close the head, substantially as set forth.

7. A device as in claim 6 combined with means encircling the shaft for adjusting the tension of the spring.

8. A machine of the character described, comprising a die head and chasers thereon, in combination with automatic means for opening the head including a trip in the path of the Work, a handle on the carriage independent of the head, said handle being connected to open and close the head, means to hold the handle in head-closing position, means biased to release the holding means, and connection from said trip to the releasing means including a dial having concentric scales of different standards thereon, and an indicating finger adjustable to different positions on the dial for indicating the time of openingv of the head, substantially as set forth.

9. A pipe threading machine having a die head, chasers thereon, means to stop the threading action on completion Vof a predetermined length of thread said means including a trigger in the path of the work, adjusting means for varying the length of the thread according to different standards said adjusting means including an element having a face visible from the working of the operator and having on said face a plurality of scales of dierent character, connections from said element to the trigger, an indeX finger cooperating with said scales, and connections from said finger to the stopping means.

10. A die head comprising a set of chasers, a cam plate connected to the chasers for moving them toward or from the work, means for actuating the cam plate including a worm engaging teeth on the cam plate, a shaft for turning the worm, a sleeve on the shaft, and coacting cam faces on the sleeve and the worm whereby a partial rotation of the sleeve moves the worm endwise to a sufficient extent for fully opening the head.

11. A die head comprising a set of chasers, a cam plate connected to the chasers for moving them toward or from the work, means for actuating the cam plate including a rotary shaft, a worm splined to the shaft, teeth on the cam plate engaging the worm, a sleeve on the shaft, means whereby the sleeve may be rotated independently of the shaft, and connections from the sleeve to the worm whereby a partial rotation of the sleeve moves the worm along the shaft to carry the chasers to their outermost position.

In testimony whereof I affix my signature.

CHARLES P. HARRISON. 

